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Can Pope Francis Transform the Climate Change Debate?

Pope Francis received a warm response at the White House Wednesday morning while delivering a brief speech calling for government action to combat global warming – much to the delight of President Obama, who stood at his side.

“Mr. President, I find it encouraging that you are proposing an initiative for reducing air pollution,” the pontiff said to a warm round of applause. “Accepting the urgency, it seems clear to me also that climate change is a problem which can no longer be left to a future generation.”

Related: Pope Francis Is Stirring the Political Pot on Global Warming

“When it comes to the care of our common home, we are living at a critical moment of history,” he added. “We still have time to make the changes needed to bring about a sustainable and integral development, for we know that things can change.”

But Francis is likely to get a more muted response to his call for action on climate change Thursday morning, when he delivers an historic address to Congress. House Speaker John Boehner (R-OH), who invited the pope to speak, Senate Majority Leader Mitch McConnell of Kentucky and many other Republicans in both chambers are ardent foes of Obama’s ambitious proposals for reducing carbon emissions.

Rep. Paul Gosar (R-AZ) recently announced he would boycott Francis’s address to a joint meeting of the House and Senate because he said the pope was promoting “questionable science.” Iowa Sen. Joni Ernst told The Guardian yesterday that she hopes the pope doesn’t veer into controversial public policy discussions but instead offers some “uplifting message about how we can all help the most vulnerable in our society.”

"I'll certainly listen respectfully, but I don't think that his speech is going to change my mind on it," Sen. John Barrasso, a member of the GOP leadership and a skeptic on climate science, told Politico.

Related: The Pros and Cons of Obama’s New Carbon Rule

In a relatively short time Pope Francis has earned wide-spread admiration for his modesty and concerns for the poor and oppressed as well as his liberal pronouncements on a broad range of issues, from same-sex marriage and the excesses of capitalism to the threat of climate change. However, while addressing lawmakers from both parties on super-charged issues such as climate change, the pope may have to walk a fine line between spiritual leader and public policy advocate.

Over the past decade, Republicans and Democrats have battled over environmental policy, particularly over efforts to cut the rate of growth of industrial carbon emissions that the GOP and business leaders have argued would adversely impact the economy and jobs. At the same time, many conservatives dispute that climate change is real or that it poses serious risks to the environment.